Android中能否基于已有的API，实现高效获取一个Bitmap内的黑色像素占比？

private int getBlackPixelsPercentage(Bitmap bitmap) {
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    int totalPixels = width * height;
    int blackPixels = 0;

    for (int x = 0; x< width; x++) {
        for (int y = 0; y< height; y++) {
            int pixelColor = bitmap.getPixel(x, y);
            int red = Color.red(pixelColor);
            int green = Color.green(pixelColor);
            int blue = Color.blue(pixelColor);
            if (red == 0 && green == 0 && blue == 0) {
                blackPixels++;
            }
        }
    }

    return (int) ((float) blackPixels / totalPixels * 100);
}